Generally, devices for dynamic voltage restoration employ gate turn off thyristors, (GTO) solid state power electronic switches in a pulse-width modulated (PWM) inverter structure.
The energy source may vary according to the design and manufacturer of the DVR, but DC capacitors and batteries drawn from the line through a rectifier are frequently used.
[4] DVRs use a technically similar approach as low voltage ride-through (LVRT) capability systems in wind turbine generators use.
Conduction losses in both kinds of devices are often minimized by using integrated gate-commutated thyristor (IGCT) technology in the inverters.
[7] DVRs may provide good solutions for end-users subject to unwanted power quality disturbances.
It may be necessary to provide local fast reactive supply sources in order to protect the system, including the DVR, from voltage collapse and cascading interruptions.